APA (7th ed.) Citation

Chopin, F., Milstein, N., Midori, & McDonald, R. Nocturne in C-sharp minor, op. posth.

Chicago Style (17th ed.) Citation

Chopin, Frédéric, Nathan Milstein, Midori, and Robert McDonald. Nocturne in C-sharp Minor, Op. Posth.

MLA (9th ed.) Citation

Chopin, Frédéric, et al. Nocturne in C-sharp Minor, Op. Posth.